Hi Guys:
Thanks for the concerned replies. I see that I raised some eyebrows to say the least on this one; it looks like I better re-read my Wiring 1-2-3 book. I'll do as Scott35 said using a 2 pole breaker on the two kitchen circuit and use seperate 12-2s on the two others. I would be using the common type of BX, I'm not sure what NM-B is. My house is from 1907 and I generally, but not in all cases, have been replacing the old cloth covered wire cable as I renovate from room to room.